Separable base and cap gas burner



.Dec. 13, 1949 H. M. REEVES SEPARABLE BASE AND CAP GAS BURNER Filed March 1, 1946 Min-mull! Q-(erberf eves a/45L. 2

ffl 1 024 Patented Dec. 13, 1949 V 2,490,ss

SEPARABLE BASE AND CAP GAS BURNER Herbert Reeves, Kankakee, Ill., assignor to Florence Stove Company, Gardner, Mass., av corporation of Massachusetts Application March 1, 1946, Serial No. 651,101

5 Claims. (01. 158116) The invention relates to gas burners and more particularly to burners of the type having separable base and head elements.

Burners of the above general character are commonly constructed with a cup-shaped base usually in the form of a casting. A separately formed head mounted within the base is provided with a radially projecting portion adapted to extend'over and cooperate with the side walls of the base' to define the outlet ports for the burner. In order to provide ports of sufficient length to prevent'backfiringyit is customary to form the side walls of the base with an overhanging inwardly projecting flange or lip of substantial width. The formation of this lip introduces substantial difiiculties in the casting of the burner bases and materially increases their cost.

One object of the invention is to improve the construction of burners of the above general character so as to eliminate the foregoing difiiculties and to provide a burner which is simple.

and inexpensive to manufacture, efiicient and reliable in operation, attractive in appearance, and easy to keep clean. I

A more specifice object is to provide a burner construction which enables the burner base to be formed with substantially straight side walls with a consequent reduction in the cost of production of the same. v

Still another object is to provide a gas burner construction which materially simplifies the finishing of the cast parts of the burner.

A further object is to provide an improved arrangement for supporting a lighter tube on the burner which eifectually prevents clogging of-the.

tube orthe lighter port by the accumulation of dirt and grease and which materially increases the life of the tube and associated parts.

Other objects and advantages of the invention will become apparent from the following detailed description of the preferred embodiment ofthe invention shown in the accompanying drawing in which:

Figure 1 is a vertical sectional view of a. gas burner embodyingthe features of the invention.

' Fig. 2 is an exploded view showing the relationship between the burner head, the auxiliary port forming member and the lighter tube.

Fig. 3 is .an -enlarged fragmentary sectional view showing the manner in which the burner base and headcoact to form the outlet ports for the burner. V

Fig. 4 is a sectional view taken in a plane substantially ontheline 4 -4 of Fig. 3. r

While the invention is susceptible of various 2 modifications and alternative constructions, 'I have shown in the drawing and will herein describe in detail the preferred embodiment, but it is to be understood that I do not thereby intend to limit the invention to the specific form disclosed, but intend to cover all modifications and alternative constructions falling within the spirit and scope of the invention as expressed in the appended claims.

Referring to the drawing, the gas burner selected to illustrate the invention comprises a generally cup-shaped base 5 including an upstanding annular side wall-G and a centrally apertured bottom wall'l. Amixture of gaseous fuel and primary air is supplied to the-burner base through a mixing tube 8 arranged to communicate with the interior of the base. In prac-' tice the base 5 and mixing tube 8 are commonly formed as, an integral casting.

Assembled with the base 5 is a mushroomshaped head 9 which cooperates therewith to form an annular distribution chamber I!) with a plurality of outlet ports ll around its outer peripheral edge. The head 9 is formed with a cylindrical stem portion I 2 and'a radially outwardly and upwardly projecting flange portion l3 dimensioned to extend over the side wall 8 of the base. As herein shown, the stem l2 and the aperture in the wall 1 of the base are threaded for interfitting engagement. The stem is preferably of tubular'form and provides a passage for supplying secondary air to the inner side of the flame ring formed by the ports II.

In the exemplary burner the marginal edge portion of the flange I3 is finished on its underside to provide anupwardly and outwardly inclined or generally 'frusto-conical area of substantial width measured radially of the flange. A series of downwardlyopening radially disposed grooves 14 in the frusto-conical area of the flange serve to define the outlet ports H for the burner as will appear presently. As shown in Fig. 3 the grooves I4 are of substantial length and are preferably generally semi-cylindrical in cross section. c

In order to simplify the construction of the base 5 and thus facilitate its production as a casting I provide an auxiliary port'forrning member l5 adapted to be interposed between the side wall 6 of the base and the flange [3 of the head to deflne therewith the outlet ports l l for the burner. The auxiliary member i5 comprises a relatively thin annulus preferably constructed of sheet metal and including a frusto-conioal port form ing element it adapted to overlie the sidewallt 3 of the base substantially transversely thereof. The upper edge of the wall 6 is beveled as at I! to provide a firm seat for the port forming element of the member.

When the burner is assembled the flange 13 of the head engages the port forming element [6 of the auxiliary member and clamps it against the beveled edge I 'lof the side Wall 6. The element l6 of the auxiliary member thus closes the lower sides of the grooves I4 in the flange to define therewith the elongated outlet ports II for the burner. It will be evident that with this construc tion the length of the ports is determined by the width of the grooved area of the flange "l3 and the width of the port forming element 1'6 independently of the thickness of the wall 6 of -the burner base. Accordingly, the latter may he formed as a relatively thin substantially straight annular Wall which can be produced easily and economically as a casting. In particular the absence of an internal flange on the wall of the burner base is advantageousfrom the production standpoint.

The auxiliary member 15 may also be utilized to substantially enclose the burned base 5 and thus make it unnecessary"to provide the base with a fine finish. To this end, the port form-ing element l 6 of the member is merged into a depending skirt portion 18 adapted to encircle andconcea-l the side wall 6 of the base.

Provision is made for accurately centering the auxiliary member it on the burner base to insure uniformity in the lengthof the ports H. For this purpose the side wall 6 'o f'the base is formed with radially-outwardly projecting locating means 2e engageable by the skirt portion l8 of the auxiliary member to locate the same with respect to the base. The locating means =20 may be in the form of a continuous rib around the wall =6 or may comprise a plurality of spaced lugs arranged circumferentially of the wall. Thus in assembling the burner it is only necessary to slip the auxiliary member over the burner base and to screw the head 9 in place therein.

To facilitate cleaning of theburner and to give it a neat, attractive appearance, theouter surface of the auxiliary member :15 :and the upper surface of the head 9 may be fln'ished with coating 2| and 2 id of vitreous enamel. As the skirt portion 18 of the member extends around and substantially conceals the side wall of the burner body 5 the need for attractively finishing the latter is avoided. Thus the 'd i-fliculty and expense of enameling the irregularly shaped b'ase casting is eliminated.

Means :is provided on the ia'uxiliarymember for supporting a lighter tube 23 in a man-ner such as to minimize the accumulation of dirt or grease at the junction between the tube and the burner. To this end the lower edge of the skirt portion [8 of the member is formed with a pairo'f tabs 24 adapted to be bent back on the member to form hook-shaped supports. The tabs 2 1 are spaced apart to receive a pair bf outwardly bent cars 25 formed on opposite sides of the lighter tube 23. A notch 26 in the skirt [8 intermediate the supporting elements 24 and a lighter port 21 in the wall 6 of the base alined with the notch 25 provide a passage for the gas issuing from the lighter port when the burner is turned on. Due to the relatively small area presented by the supports 24 and ears 25, the tendency for dirt and grease to collect around the lighter port is minimized. Clogging of the lighter port and tube is thus effectivel prevented and damage to the tube through the burning of such accumulated materials is eliminated with a corresponding increase in the useful life of the tube.

The improved burner may be constructed to provide an inner flame ring if desired by providing suitable ports 30 in the flange l3 of the head communicating with the annular distribution chamber 10. These .ports are preferably formed intermediate the stem l2 and the marginal edge portion of the flange. As shown in Fig. 1 the ports are preferably inclined so as to .produce an inwardly and upwardly directed flame.

It will be apparent from the foregoing that the invention provides a gas burner of novel and advantageous construction which is simple and inexpensive to manufacture, attractive in appearance and eflicient and reliable in operation. The'provision of an auxiliary member adapted to be interposed between the burner base and the head and cooperating with the head in forming the 'main outlet'ports for the burner provides ports of sufficient length to effectually prevent b'ackflring and at the same time permits the base to be constructed with'straight side walls. Thus manufacture of the burner base. is simplified without sacriflcing burner efficiency. The use of the auxiliary member is also advantageous in that it is easily finished :in an attractive manner and eliminates the need for finishing the cast base portion of the burner. Furthermore the auxiliary member maybe conveniently arranged for supporting the lighter tube in a manner such as'zto minimize the accumulation of dirt and grease around the burner.

I claim as my invention:

1. In a gas burner, in combination, a burner base including a bottom wall and an upright annular side wall, a head mounted on said base substantially centrally of said side wall and having a radially projecting flange portion extending above the side wall, a sheet metal member having an inwardly and downwardly projecting port forming portion interposed between the top of said side wall and the flange portion of said head, said flange being formed on its un derside with radially disposed grooves cooperating with the port forming portion of said member to define outlet ports for the burner, a depending skirt portion integral with said port forming portion of the member encircling said side wall, and 'a pair of hook-shaped lugs spaced apart circumferentially of said skirt portion of the member and projecting radially therefrom for supporting a lighter tube, said skirt portion and said wall being apertured to provide a gas discharge port between said lugs.

2. In a gas burner, in combination, a burner base including an upright annular side wall and a bottom wall, said side wall having a radially opening lighter port, a head having a stem supported on the bottom wall substantially centrally of the side wall and a radially projecting flange portion extending above the wa11,-a sheet metal member including a depending skirt portion encircling said side 'wall and an inwardly and downwardly inclined flange portion overlying the upper edge of said side wall, one of said flange portions being formed with radially disposed grooves cooperating with the other flange por-' tion to form outlet ports for the burner, a lighter tube having a pair of laterally bent ears at one end, and-a pair ofradially'projecting lugs on said skirt portion spaced apart to receive said cars 76 and thereby support the lighter tube, said lugs being located on opposite sides of the lighter port in said wall and said skirt portion having an opening between the lugs to provide a passage for the gas issuing from the lighter port.

3. A gas burner comprising, in combination, a burner base including an upright side wall and a bottom wall, a burner head having a central stem portion adapted to be secured to said bottom wall and cooperating with the base to form an annular fuel distribution chamber, a flange adjacent the upper end of said stem projecting radially outwardly to overlie the upper edge t said side wall and acting to close the upper end of said chamber, said flange having the underside of its marginal edge portion formed with radially disposed grooves, and a sheet metal member having an annular portion interposed between the upper edge of said side wall and the grooved portion of said flange to define therewith a series of burner ports opening from said chamber, said annular portion of the member having a width materially greater than the thickness of said side wall so as to make the burner ports substantially longer than the thickness of said side wall.

4. A gas burner comprising, in combination, a burner base including an upright side wall and a bottom wall, a burner head having a central stem portion adapted to be secured to said bottom wall and cooperating with the base to form an annular fuel distribution chamber, a flange adjacent the upper end of said stem projecting radially outwardly to overlie the upper edge of said side wall and acting to close the upper end of said chamber, a sheet metal member having an annular portion interposed between and coacting with the upper edge of said side wall and the overlying portion of said flange, one of said coacting parts being formed with radially disposed grooves to provide a series of burner ports opening from said chamber, said annular portion of the member having a width materially greater than the thickness of said side wall so as to make said burner ports substantially longer than the thickness of said side wall.

5. A gas burner comprising, in combination, a burner base including an upright side wall and a bottom wall, a burner head having a central stem portion adapted to be secured to said bottom wall and cooperating with the base to form an annular fuel distribution chamber, a flange adjacent the upper end of said stem projecting radially outwardly to overlie the upper edge of said side wall and acting to close the upper end of said chamber, a sheet metal member having an annular portion interposed between and coacting with the upper edge of said side wall and the overlying portion of said flange, one of said coacting parts being formed with radially disposed grooves to provide a series of burner ports opening from said chamber and said annular portion of the member being of a width such as to make said ports substantially longer than the thickness of said side wall, a skirt portion depending from the outer edge of the annular portion of said member, and means on said side wall coacting with said skirt portion to center the member with respect to the burner base.

HERBERT M. REEVES.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS FOREIGN PATENTS Country Date Great Britain Nov. 18, 1935 Number Number 

